Speaker enclosure



FIG. 1 is a top, front and left side perspective view of a speaker enclosure showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a left side elevational view thereof, the right side being a mirror image;

FIG. 4 is a rear elevational view thereof; and

FIG. 5 is a bottom plan view thereof. 

The ornamental design for a speaker enclosure, as shown and described. 